There are obviously a lot of great ETBs in Magic, but its probably worth noting that elementals often have good ETBs
It encourages your opponents to power up their armies and then send them into battle with someone else
So much of this deck is built around accruing tons of value from your cards thanks to cards like Bigger on the Inside which helps ramp up in mana while giving your next spell cascade
Starting Tuesday, March 24, you'll be able to buy in-game armor sets themed around the MTG Planeswalkers Chandra Nalaar (Flamecaller Set), Jace Beleren (Mindsculptor set, no prizes for guessing that pun), and Liliana Vess (Death's Majesty set)
Silver lining is that dups can be used to make trades with buddies or strengthen your deck by having multiples of a specific card
The second issue is figuring out how to win the game after resolving Worldfire